sctputil.h

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *
 * c) Neither the name of Cisco Systems, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
 
#ifndef _NETINET_SCTP_UTIL_H_
#define _NETINET_SCTP_UTIL_H_
 
#if defined(_KERNEL) || defined(__Userspace__)
 
#define SCTP_READ_LOCK_HELD 1
#define SCTP_READ_LOCK_NOT_HELD 0
 
#ifdef SCTP_ASOCLOG_OF_TSNS
void sctp_print_out_track_log(struct sctp_tcb *stcb);
#endif
 
#ifdef SCTP_MBUF_LOGGING
struct mbuf *sctp_m_free(struct mbuf *m);
void sctp_m_freem(struct mbuf *m);
#else
#define sctp_m_free m_free
#define sctp_m_freem m_freem
#endif
 
#if defined(SCTP_LOCAL_TRACE_BUF)
void
     sctp_log_trace(uint32_t fr, const char *str SCTP_UNUSED, uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t e, uint32_t f);
#endif
 
#define sctp_get_associd(stcb) ((sctp_assoc_t)stcb->asoc.assoc_id)
 
/*
 * Function prototypes
 */
int32_t
        sctp_map_assoc_state(int);
 
uint32_t
         sctp_get_ifa_hash_val(struct sockaddr *addr);
 
struct sctp_ifa *sctp_find_ifa_in_ep(struct sctp_inpcb *inp, struct sockaddr *addr, int hold_lock);
 
struct sctp_ifa *sctp_find_ifa_by_addr(struct sockaddr *addr, uint32_t vrf_id, int holds_lock);
 
uint32_t sctp_select_initial_TSN(struct sctp_pcb *);
 
uint32_t sctp_select_a_tag(struct sctp_inpcb *, uint16_t lport, uint16_t rport, int);
 
int sctp_init_asoc(struct sctp_inpcb *, struct sctp_tcb *, uint32_t, uint32_t, uint32_t, uint16_t);
 
void sctp_fill_random_store(struct sctp_pcb *);
 
void
sctp_notify_stream_reset_add(struct sctp_tcb *stcb, uint16_t numberin,
    uint16_t numberout, int flag);
void
     sctp_notify_stream_reset_tsn(struct sctp_tcb *stcb, uint32_t sending_tsn, uint32_t recv_tsn, int flag);
 
/*
 * NOTE: sctp_timer_start() will increment the reference count of any relevant
 * structure the timer is referencing, in order to prevent a race condition
 * between the timer executing and the structure being freed.
 *
 * When the timer fires or sctp_timer_stop() is called, these references are
 * removed.
 */
void
sctp_timer_start(int, struct sctp_inpcb *, struct sctp_tcb *,
    struct sctp_nets *);
 
void
sctp_timer_stop(int, struct sctp_inpcb *, struct sctp_tcb *,
    struct sctp_nets *, uint32_t);
 
int
    sctp_dynamic_set_primary(struct sockaddr *sa, uint32_t vrf_id);
 
void
sctp_wakeup_the_read_socket(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    int so_locked
    SCTP_UNUSED
);
 
void
sctp_add_to_readq(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_queued_to_read *control,
    struct sockbuf *sb,
    int end,
    int inpread_locked,
    int so_locked);
 
void sctp_iterator_worker(void);
 
uint32_t sctp_get_prev_mtu(uint32_t);
uint32_t sctp_get_next_mtu(uint32_t);
 
void
     sctp_timeout_handler(void *);
 
int
sctp_calculate_rto(struct sctp_tcb *, struct sctp_association *,
    struct sctp_nets *, struct timeval *, int);
 
uint32_t sctp_calculate_len(struct mbuf *);
 
caddr_t sctp_m_getptr(struct mbuf *, int, int, uint8_t *);
 
struct sctp_paramhdr *
sctp_get_next_param(struct mbuf *, int,
    struct sctp_paramhdr *, int);
 
struct mbuf *sctp_add_pad_tombuf(struct mbuf *, int);
 
struct mbuf *sctp_pad_lastmbuf(struct mbuf *, int, struct mbuf *);
 
void sctp_ulp_notify(uint32_t, struct sctp_tcb *, uint32_t, void *, int);
 
void
sctp_pull_off_control_to_new_inp(struct sctp_inpcb *old_inp,
    struct sctp_inpcb *new_inp,
    struct sctp_tcb *stcb, int waitflags);
 
void sctp_stop_timers_for_shutdown(struct sctp_tcb *);
 
/* Stop all timers for association and remote addresses. */
void sctp_stop_association_timers(struct sctp_tcb *, bool);
 
void sctp_report_all_outbound(struct sctp_tcb *, uint16_t, int);
 
int sctp_expand_mapping_array(struct sctp_association *, uint32_t);
 
void
sctp_abort_notification(struct sctp_tcb *, bool, bool, uint16_t,
    struct sctp_abort_chunk *, int);
 
/* We abort responding to an IP packet for some reason */
void
sctp_abort_association(struct sctp_inpcb *, struct sctp_tcb *, struct mbuf *,
    int, struct sockaddr *, struct sockaddr *,
    struct sctphdr *, struct mbuf *,
    uint8_t, uint32_t,
    uint32_t, uint16_t);
 
/* We choose to abort via user input */
void
sctp_abort_an_association(struct sctp_inpcb *, struct sctp_tcb *,
    struct mbuf *, bool, int);
 
void
sctp_handle_ootb(struct mbuf *, int, int,
    struct sockaddr *, struct sockaddr *,
    struct sctphdr *, struct sctp_inpcb *,
    struct mbuf *,
    uint8_t, uint32_t, uint16_t,
    uint32_t, uint16_t);
 
int
sctp_connectx_helper_add(struct sctp_tcb *stcb, struct sockaddr *addr,
    int totaddr, int *error);
 
int
sctp_connectx_helper_find(struct sctp_inpcb *, struct sockaddr *,
    unsigned int, unsigned int *, unsigned int *, unsigned int);
 
int sctp_is_there_an_abort_here(struct mbuf *, int, uint32_t *);
#ifdef INET6
uint32_t sctp_is_same_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);
 
struct sockaddr_in6 *sctp_recover_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);
 
#define sctp_recover_scope_mac(addr, store) do { \
         if ((addr->sin6_family == AF_INET6) && \
             (IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr))) { \
                *store = *addr; \
                if (addr->sin6_scope_id == 0) { \
                        if (!sa6_recoverscope(store)) { \
                                addr = store; \
                        } \
                } else { \
                        in6_clearscope(&addr->sin6_addr); \
                        addr = store; \
                } \
         } \
} while (0)
#endif
 
int sctp_cmpaddr(struct sockaddr *, struct sockaddr *);
 
void sctp_print_address(struct sockaddr *);
 
int
sctp_release_pr_sctp_chunk(struct sctp_tcb *, struct sctp_tmit_chunk *,
    uint8_t, int);
 
struct mbuf *sctp_generate_cause(uint16_t, char *);
struct mbuf *sctp_generate_no_user_data_cause(uint32_t);
 
void
sctp_bindx_add_address(struct socket *so, struct sctp_inpcb *inp,
    struct sockaddr *sa, uint32_t vrf_id, int *error,
    void *p);
void
sctp_bindx_delete_address(struct sctp_inpcb *inp, struct sockaddr *sa,
    uint32_t vrf_id, int *error);
 
int sctp_local_addr_count(struct sctp_tcb *stcb);
 
#ifdef SCTP_MBCNT_LOGGING
void
sctp_free_bufspace(struct sctp_tcb *, struct sctp_association *,
    struct sctp_tmit_chunk *, int);
 
#else
#define sctp_free_bufspace(stcb, asoc, tp1, chk_cnt)  \
do { \
        if (tp1->data != NULL) { \
                atomic_subtract_int(&((asoc)->chunks_on_out_queue), chk_cnt); \
                if ((asoc)->total_output_queue_size >= tp1->book_size) { \
                        atomic_subtract_int(&((asoc)->total_output_queue_size), tp1->book_size); \
                } else { \
                        (asoc)->total_output_queue_size = 0; \
                } \
                if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
                    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
                        if (stcb->sctp_socket->so_snd.sb_cc >= tp1->book_size) { \
                                atomic_subtract_int(&((stcb)->sctp_socket->so_snd.sb_cc), tp1->book_size); \
                        } else { \
                                stcb->sctp_socket->so_snd.sb_cc = 0; \
                        } \
                } \
        } \
} while (0)
 
#endif
 
#define sctp_free_spbufspace(stcb, asoc, sp)  \
do { \
        if (sp->data != NULL) { \
                if ((asoc)->total_output_queue_size >= sp->length) { \
                        atomic_subtract_int(&(asoc)->total_output_queue_size, sp->length); \
                } else { \
                        (asoc)->total_output_queue_size = 0; \
                } \
                if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
                    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
                        if (stcb->sctp_socket->so_snd.sb_cc >= sp->length) { \
                                atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc,sp->length); \
                        } else { \
                                stcb->sctp_socket->so_snd.sb_cc = 0; \
                        } \
                } \
        } \
} while (0)
 
#define sctp_snd_sb_alloc(stcb, sz)  \
do { \
        atomic_add_int(&stcb->asoc.total_output_queue_size,sz); \
        if ((stcb->sctp_socket != NULL) && \
            ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
                atomic_add_int(&stcb->sctp_socket->so_snd.sb_cc,sz); \
        } \
} while (0)
 
/* functions to start/stop udp tunneling */
void sctp_over_udp_stop(void);
int sctp_over_udp_start(void);
 
int
sctp_soreceive(struct socket *so, struct sockaddr **psa,
    struct uio *uio,
    struct mbuf **mp0,
    struct mbuf **controlp,
    int *flagsp);
 
void
     sctp_misc_ints(uint8_t from, uint32_t a, uint32_t b, uint32_t c, uint32_t d);
 
void
sctp_wakeup_log(struct sctp_tcb *stcb,
    uint32_t wake_cnt, int from);
 
void sctp_log_strm_del_alt(struct sctp_tcb *stcb, uint32_t, uint16_t, uint16_t, int);
 
void sctp_log_nagle_event(struct sctp_tcb *stcb, int action);
 
#ifdef SCTP_MBUF_LOGGING
void
     sctp_log_mb(struct mbuf *m, int from);
 
void
     sctp_log_mbc(struct mbuf *m, int from);
#endif
 
void
sctp_sblog(struct sockbuf *sb,
    struct sctp_tcb *stcb, int from, int incr);
 
void
sctp_log_strm_del(struct sctp_queued_to_read *control,
    struct sctp_queued_to_read *poschk,
    int from);
void sctp_log_cwnd(struct sctp_tcb *stcb, struct sctp_nets *, int, uint8_t);
void rto_logging(struct sctp_nets *net, int from);
 
void sctp_log_closing(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int16_t loc);
 
void sctp_log_lock(struct sctp_inpcb *inp, struct sctp_tcb *stcb, uint8_t from);
void sctp_log_maxburst(struct sctp_tcb *stcb, struct sctp_nets *, int, int, uint8_t);
void sctp_log_block(uint8_t, struct sctp_association *, ssize_t);
void sctp_log_rwnd(uint8_t, uint32_t, uint32_t, uint32_t);
void sctp_log_rwnd_set(uint8_t, uint32_t, uint32_t, uint32_t, uint32_t);
int sctp_fill_stat_log(void *, size_t *);
void sctp_log_fr(uint32_t, uint32_t, uint32_t, int);
void sctp_log_sack(uint32_t, uint32_t, uint32_t, uint16_t, uint16_t, int);
void sctp_log_map(uint32_t, uint32_t, uint32_t, int);
void sctp_print_mapping_array(struct sctp_association *asoc);
void sctp_clr_stat_log(void);
 
#ifdef SCTP_AUDITING_ENABLED
void
sctp_auditing(int, struct sctp_inpcb *, struct sctp_tcb *,
    struct sctp_nets *);
void sctp_audit_log(uint8_t, uint8_t);
 
#endif
uint32_t sctp_min_mtu(uint32_t, uint32_t, uint32_t);
void sctp_hc_set_mtu(union sctp_sockstore *, uint16_t, uint32_t);
uint32_t sctp_hc_get_mtu(union sctp_sockstore *, uint16_t);
void sctp_set_state(struct sctp_tcb *, int);
void sctp_add_substate(struct sctp_tcb *, int);
uint32_t sctp_ticks_to_msecs(uint32_t);
uint32_t sctp_msecs_to_ticks(uint32_t);
uint32_t sctp_ticks_to_secs(uint32_t);
uint32_t sctp_secs_to_ticks(uint32_t);
 
#endif                          /* _KERNEL */
#endif